Unique tetranuclear heterometallic compound [Na2Zn2{(4-py)C(H)(NOH)}2(CH3COO)6(H2O)4].2H2O with luminescent properties

The luminescent heterometallic material, [Na2Zn2{(4-py)C(H)NOH}2(CH3COO)6(H2O)4].2H2O (1), where (4-py)C(H)NOH = pyridine-4-carbaldehyde oxime, was synthesized and characterized by single crystal X-ray method. In the centrosymmetric tetranuclear molecule each sodium site is bound to six oxygen atoms, the donor atoms come from three acetate anions and three water molecules, two of which act as μ2-aqua bridges between Na(I) centers. Each zinc site is bound to three oxygen atoms from the same acetate anions and one nitrogen atom from the capped (4-py)C(H)NOH molecule which coordinates via pyridine nitrogen. The bridging acetate ligands show two coordination modes within one compound.

Graphical abstractThe unprecedented heterometallic tetranuclear compound [Na2Zn2{(4-py)C(H)NOH}2(CH3COO)6(H2O)4].2H2O, where (4-py)C(H)NOH = pyridine-4-carbaldehyde oxime was synthesized and characterized by single crystal X-ray method. The acetate anions and water molecules bridge the metal centers. The capped (4-py)C(H)NOH molecules coordinate to the terminal Zn(II) atoms via pyridine nitrogens. The new material reveals strong luminescent properties.Figure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights► Synthesis and X-ray structural study of tetranuclear heterometallic Zn-Na cluster. ► Two bridging coordination modes of acetate anion were registered in one compound. ► The compound exhibits luminescence emission.